United States Department of Transportation
i
Impact of Deicing Salts on Corrosion Rates of MSE Reinforcement – Phase 2
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2019-11-01
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[PDF-2.44 MB]
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Edition:Final Report June 2014 – November 2019
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Abstract:SPTC Project 14.6-36: Phase II involved a detailed laboratory study in which rates of corrosion were measured in MSE steel reinforcement specimens embedded in a granular MSE backfill. Two separate gradations, AASHTO standard gradation for MSE backfill and AASHTO NO.57 of one selected crushed limestone source obtained from Vulcan materials in Brownwood, Texas were included in this phase of the study. The materials were subjected to repeated cycles of saturation (inundation) and desaturation (drainage) and changes in rates of corrosion as well as changes in electrochemical properties and moisture content were monitored continuously. Tests were conducted with fresh water (RO water) only and with a saline solution followed by fresh water. The above saturation-desaturation regime was adopted to simulate exposure to runoff from deicing salt applications and/or coastal flooding followed by flushing out of salt by rain water that percolate through backfill. All tests were conducted in replicates of two. The resistivity of the coarse granular backfill under fully saturated conditions was found to be higher than that of the standard backfill. However, the factor that had the greatest impact on the rate of corrosion was the material’s ability to drain quickly. The coarse granular backfill responded more readily when saline water was introduced. But it also recovered more quickly during subsequent cycles of fresh water saturation-desaturation cycles.
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